On my last SUV, I ran the Sirius antenna to the rear of the vehicle and attached the magnetic antenna on the roof. I didn't have to remove any molding and the reception was perfect.

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2009 E70 X5 xDrive 48i M Sport
2008 E92 M3 Coupe 6MT
2001 E46 M3 - Sold | 1997 E36 M3 - Sold | BMW CCA member